Electric elevator-switch



Patented Apr. I8, |899.

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(Application 81nd Aug. 1, 1898.)

2 Sheets-*Sheet I.

(No Model.)

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UNITED STATES PATENT OFFICE,

DAVID H. DARRIN, OF CRANFORD, NElV JERSEY.

ELECTRIC ELEVATOR-SWITCH.

SPECIFICATION forming part of Letters Patent No. 623,142, dated April 18, 1899.

lnerial No. 687,407. (No model.)

To @ZZ whom t may concern:

Beit known thatl, DAVID H. DARRIN, a citizen of the United States, residingat Cranford, in the county of Union and State of New Jersey, haveinvented certain new and useful'lm* provements in Electric Elevator-Switches, of which the following is a full, clear, and exact specification.

My invention relates to electric switches, and particularly to switches used in connection with elevator-work.

The object of the invention is to construct a switch in which the contact-surfaces will always be clean, and therefore carry the full current and do away with the objectionable tendency of the switch-jaws to become blistered and the temper of the parts destroyed.

A :further object is to construct a switch which shall, in connection with elevator apparatus, be adapted to close the circuit through the motor, and thus start the latter in ad- Vance of the releasing of the brake and shifting of the belt to operate the hoisting-cables. In elevator apparatus this latter feature is a decided advantage in that it enables the motor to start without load before the belt is shifted and the work of raising ,the car commenced.

A still further object is to bring the switchblade into contact with the jaws of the switch far enough to start the motor at the earliest possible moment after the operator pulls the starter-rope. h

The invention will be more particularly described with reference to the forms thereof shown in the accompanying drawings, in which- Figure 1 is a side View of the switch and its connections applied to a common type of elevatorapparatus'. Fig. 2 is an enlarged view of the switch shown in Fig. 1, showing in dot'A ted lines the position of the blade when the switch is completely closed. Fig. 3 is a similar view of a switch adapted to be thrown in one direction only. Fig. 4f is an end View of Fig. 2, and Fig. 5 is a detail perspective View of means for releasing the brake and shifting the belts.

Referring more particularly to the drawings, 1 represents the customary base upon which the switch is mounted, 2 the bearings in which the operating-lever 3 is mounted,

and 4 4: the contact-jaws between which the switch-blade 5 is pushed to close the switch. The blade 5 is pivoted in the bearings 2 and must be su flicien tl y long to present a contactsurface extending beyond the contact-jaws Lt a distance equal to thewidth of such jaws. The contact-jaws 4L must extend in a direction tangent to the circle of movement of the switch-blade, and its contact-surface must project outside of the circle traversed by a point on the blade at the outside of the contactejaws when the switch is in closed position. For instance, in Fig. 2 let G represent the point on the blade where the contact-surface of the jaw ends. The jaws must extend outside of the circle traversed by this point.

On either side of lever 3 are arms 7 and'S in line with the contact-'jaws and provided with a suitable opening l), through which passes a bar of ber 10, joining together the switch-blades on the opposite sides, the switch being shown here as a double-pole switch because of its adaptability to elevator-work. A spring 11 connects the bar 10 with the lever 3 to make the switch a quick-break. These details of construction, however, it will be understood, form no part of myinvention, as the switch may have one or more poles or be quick-break or not, according to the work for which the switch is intended to be used.

12 represents the usual controller-wheel, mounted in the elevator-shaft or on the winding-machine, and which is operated by a rope 13, extending the length of the shaft and passing through the car, the movement of Wheel 12 releasing brake 14 and permitting the rotation of the drum upon which the caf ble is wound. Numerous ways may be devised and used for releasing the brake by the rotation of wheel 12. In the drawings I have illustrated in Fig. 5 a common construction, in which 2l is a weighted lever connected with the strap 24, encircling the iiXed pulley 23 and adapted to be drawn tightly around the wheel when the weight on the lever is not resisted. A lug 35, carried by wheel 12, is adapted to strike against arm 2O when wheel 12 has made about one-quarter of a revolution and operate said arm to loosen thestrap 24 and release theA brake. When the wheel is turned farther in the same direction, the lug 28 on wheel 12 will strike the end of the IOO slot 20 in which it travels and move the beltshifter 30 in the desired direction to shift the belts. If the wheel be turned in the opposite direction, the lug29 on wheel 12 engages the slot 27 in substantially the same manner as before described. rllhe hoisting-drum referred to does not appear in the drawings, but is ordinarily behind the gear-case 15, in which is located the gear between the drum and the pulleys 1G and 22, upon which the belt connected with the motor is placed. The c urrent for the motoris controlled by the switch. To the wheel 1Q, or to a separate piece 17 attached thereto, is connected a rod 1S, which is also connected with an extension 19 of the lever 3. The rod 1S is of such length that a slight movement of wheel 12 will cause the blade 5 to strike against the jaws at on one side or the other, according as the wheel is turned, both sets of jaws being connected with the motor. These last two connections I have not shown in the drawings, for the reason that they are to be found on every elevator apparatus of this type and any suitable connection may be used.

The feature to be observed in the construction of my device is to so adjust lever 1S that the switch-blade will make contact with the jaws in advance of the release of the brake and the shifting of the belts. As the wheel 12 turns further the movement of blade 5 will become slower; but this is unimportant after the first quick contact has been made.

In the operation of the device the rope 13 is pulled in the usual manner, turning wheel 12. r1`he connection between wheel 12 and lever 3 by rod 18 will quickly throw the switch-blade into contact with the ends of the jaws et and start the motor to raise or lower the car, according to the direction in which the wheel is turned and the belt shifted. The surface of blade 5 which first makes contact with jaws 4t is that beyond the point (i, and as the blade moves farther down between the jaws the surface of the blade inside of point G will slide into contact withthe jaws, the latter surface of the blade and the surface of the jaws which it touches being always clean surfaces and not presenting any edges or rough surfaces from which sparking could occur when the switch is opened. Obviously the only point at which sparking or blistering could occur is at the ends of the jaws and the surface of the blade beyond point 6, and these'surfaces do not touch each other when the switch is finally closed. r1`his will prevent the temper of the jaws from being destroyed by the resistance heretofore interposed by blistered surfaces and at the same time will increase the carryingcapacity and life of the switch. lVhen the switch has reached its final position, the

movement of wheel 12 will have been far enough to release the brake and shift the belt to the proper pulley to move the car.

Having thus described my invention, I claim- 1. In a switch, the combination of a pivoted carrying-blade and one or more straight contact-jaws located within and at a tangent to the circle of movement of the blade, the end or ends of said jaws extending beyond the said circle, substantially as described.

2. The combination with an elevator-hoisting apparatus including a belt-shifter, brake and motor, of a switch comprising a carryingblade and one or more contact-jaws, said blade and said jaws each having an initial and a final contact-surface, the said contactsurfaces of the blade being adapted to make contact only with the like surfaces of the jaws, and means for operating said belt-shifter and releasing said brake when said final surfaces make contact, substantially as described.

3. The combination with an elevator-hoisting apparatus including a belt-shifter, brake and motor, of a switch controlling the operation of said motor and comprising a carryingblade and one or more contact-jaws, said blade having an initial and a final contactsurface, means whereby said initial surface is first brought into contact with the jaws and then without opening the switch the fin al su rface is brought into contact with another part of said jaws, and means for operating said belt-shifter and releasing said. brake when said final surface of the blade is brought into contact with the jaws, substantially as described.

i. The combination with an elevator-hoisting apparatus including a belt-shifter, brake and motor, of a switch controlling the operation of the motor, and means, operated from the car, for starting the motor and then shifting the belts and releasing the brake, substantially as described.

The combination with an elevator-hoisting apparatus including a belt-shifter, brake and motor, of a switch controlling the opera-- tion of said motor, means, operated from the car, for releasing said brake and operating the belt-shifter, and means connected with said first means, whereby the operation of the former will operate the latter to close said switch in advance of the shifting of the belts and release of the brake, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

DAVID II. DARRIN.

Witnesses:

Ina G. DA1-min, C. V. EDwARDs.

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